20mph speed limits don’t cut the number of car crashes or casualties, study finds 

Researchers collected data on traffic collisions, casualties, driver speed and traffic volume before a 20mph limit was introduced in Belfast, as well as one and three years afterwards.Researchers collected data on traffic collisions, casualties, driver speed and traffic volume before a 20mph limit was introduced in Belfast, as well as one and three years afterwards.Read MoreHealth News | Mail Online